arm: mvebu: Disable MBUS error propagation

Accessing MBUS windows not backed-up by e.g. PCIe devices will
hang the SoC. Disable MBUS error propagation back to CPU allows
to read 0xffffffff instead of hanging the SoC.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Luka Perkov <luka.perkov@sartura.hr>

arch/arm/mach-mvebu/cpu.c

@@ -241,6 +241,9 @@ int arch_cpu_init(void)
 	 */
 	mvebu_mbus_probe(windows, ARRAY_SIZE(windows));
 
+	/* Disable MBUS error propagation */
+	clrsetbits_le32(SOC_COHERENCY_FABRIC_CTRL_REG, MBUS_ERR_PROP_EN, 0);
+
 	return 0;
 }
 #endif /* CONFIG_ARCH_CPU_INIT */

arch/arm/mach-mvebu/include/mach/soc.h

@@ -66,6 +66,9 @@
 #define MVEBU_SATA0_BASE	(MVEBU_REGISTER(0xa8000))
 #define MVEBU_SDIO_BASE		(MVEBU_REGISTER(0xd8000))
 
+#define SOC_COHERENCY_FABRIC_CTRL_REG	(MVEBU_REGISTER(0x20200))
+#define MBUS_ERR_PROP_EN	(1 << 8)
+
 #define MBUS_BRIDGE_WIN_CTRL_REG (MVEBU_REGISTER(0x20250))
 #define MBUS_BRIDGE_WIN_BASE_REG (MVEBU_REGISTER(0x20254))